#include <iostream>
using namespace std;
int n,arr[105][105],t[105][105],l[105];
int main() {
	cin>>n;
	for(int i=1;i<=n;i++){
		int k;
		cin>>k;
		for(int j=1;j<=k;j++){
			cin>>arr[i][j];
			t[arr[i][j]][l[arr[i][j]]+1]=i;
			l[arr[i][j]]++;
		}
	}
	for(int i=1;i<=n;i++){
		cout<<l[i]<<" ";
		for(int j=1;j<=l[i];j++){
			cout<<t[i][j]<<" ";
		}
		cout<<"\n";
	}
	return 0;
}